A former Starbucks employee told Business Insider things you should never do at the coffee chain.<br />Don't collect a beverage without looking at the name on the cup.<br />Don't expect a free refill on every drink.<br />Avoid asking for drink add-ins after you've already paid.<br />Please don't leave a mess at the sugar and milk area.<br />Ordering off of the "secret menu" can be a real headache for baristas.<br />Don't get in line if you don't know what you want to order yet.
